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Strongly Emitting Surfaces Unable to Float below Plasma Potential.

M D Campanell1, M V Umansky1

  • 1Lawrence Livermore National Laboratory, P.O. Box 808(L-630), Livermore, California 94551, USA.

Physical Review Letters
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This summary is machine-generated.

Strong electron emission in plasma physics has a significant impact on plasma-surface interactions. Our research demonstrates that a positive floating potential is the only stable equilibrium, even when starting from a negative potential state.

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Area of Science:

  • Plasma Physics
  • Surface Science
  • Computational Physics

Background:

  • Investigating the effects of strong electron emission on plasma-surface interactions is crucial.
  • Existing models present conflicting predictions for particle and energy balance based on negative and positive floating potentials.

Purpose of the Study:

  • To determine the general equilibrium state of plasma-surface interactions under strong electron emission.
  • To elucidate the transition dynamics from negative to positive floating potentials.

Main Methods:

  • Development of a novel simulation code to model plasma-surface interactions.
  • Analysis of particle and energy balance under varying potential conditions.

Main Results:

  • The positive floating potential state is identified as the sole possible equilibrium.
  • Ionization collisions near the surface drive a transition from negative to positive potential states, irrespective of the initial condition.

Conclusions:

  • The positive floating potential is the universally stable state in plasma-surface interactions with strong electron emission.
  • The developed simulation code successfully demonstrates the transition mechanism to this stable state.